I have a rMBP 13" late 2013 model and just updated Mavericks today to 10.9.2 (Software OS X 10.9.2 (13C64))
I have been using the OSX package of keepass from here (Openix) without any issues before ...

This is probably bad form for this board, and feel free to delete it if it is, but running brew doctor reveals the following:
Warning: /usr/local/lib/pkgconfig isn't writable.
This can happen if you ...